We are all "sons of God". The question put to us by Christ is will we accept this assignation, and can we set our own fears and desires aside, so as to fulfill it?
It is true that all humankind, and even the angels all owe their family names to God:
"For this reason I bend my knees to the Father, 15 to whom every family in heaven and on earth owes its name."-Ephesians 3:14, 15.
This is due to the fact that he created us all. Humankind is the offspring of Adam, we are not a separate creation of him, Rather we are from him, and are made of the same genetic material, the same DNA as Adam who was ousted from God's family when he sinned along with the rebel angels, with Satan as their ringleader.
So humankind in general today are alienated from God, they are dead spiritually in his eyes, they are not his children:
(Ephesians 2:12) . . .At that time you were without Christ, alienated from the state of Israel, strangers to the covenants of the promise; you had no hope and were without God in the world.
"They are the ones who have acted corruptly.
They are not his children, the defect is their own.
They are a crooked and twisted generation!"
-Deuteronomy 32:5.
The only way to have a relationship with God is through the mediator between God and man Jesus Christ. Jehovah has put this mediator in place in order that sinful man can approach his throne and still have a relationship with him.
God does have adopted sons on earth, but they are relatively few. They are born from above with holy spirit, and are called to heaven to serve with Jesus Christ as kings over the earth.
They are justified based on their faith in Jesus' shed ransom, and in God's eyes although sinners are considered perfect. He has the legal right to claim them as his children by means of the same ransom that was paid for them:
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Because those whom he gave his first recognition he also foreordained to be patterned after the image of his Son, so that he might be the firstborn among many brothers. 30 Moreover, those whom he foreordained are the ones he also called; and those whom he called are the ones he also declared to be righteous. Finally those whom he declared righteous are the ones he also glorified."-Romans 8:29, 30.
It is only by means of the manifestation of these 144,000 anointed in heaven that those on earth will be reclaimed into God's family:
"For the creation is waiting with eager expectation for the revealing of the sons of God. 20 For the creation was subjected to futility, not by its own will, but through the one who subjected it, on the basis of hope 21 that the creation itself will also be set free from enslavement to corruption and have the glorious freedom of the children of God."-Romans 8:19-21.
The creation, that is the offspring of Adam, is waiting for the revealing of the sons of God, these 144,000 anointed chosen and called congregation of God. This will be after Jesus comes to wage war on wicked human society and sets up his kingdom government over all the earth. Meek humans will inherit the earth and the dead ones will be resurrected back to life. Then the full benefit of the rule God's sons, Jesus Christ and the 144,000 anointed Christian congregation, will be clear for all to see.
For creation was subjected to futility, that is humankind was subjected to death, on the basis of hope. In the garden of Eden Jehovah said that the offspring of the woman would bruise the serpent in his head. That is kill him. And when that happens at the end of the 1,000 year reign, Jesus Christ will have brought all righteous humans living on earth back to the perfect state humankind had at its start. Then death will be no more, and there will be no more sickness or pain or sorrow. Then Jesus will hand the kingdom back to his Father Jehovah and God will again welcome humankind back into his family. And then all humans will live forever on earth as
children of God:
"Next, the end, when he hands over the Kingdom to his God and Father, when he has brought to nothing all government and all authority and power. 25 For he must rule as king until God has put all enemies under his feet. 26 And the last enemy, death, is to be brought to nothing. 27 For God “subjected all things under his feet.” But when he says that ‘all things have been subjected,’ it is evident that this does not include the One who subjected all things to him. 28 But when all things will have been subjected to him, then the Son himself will also subject himself to the One who subjected all things to him, that God may be all things to everyone." - 1 Corinthians 15:24-28.